Answer:
9u² + 4u + 9
Respond w/ any questions...
9u^2 + 4u + 9
Step-by-step explanation:
eliminate parentheses - 4u + 9 + 9u^2
rearrange terms - 9u^2 + 4u + 9
5 is the width and 7 is the length
your answer will be y-b because it is common in all the expression